Now the house was full of men and women; and all the lords of the Philistines were there; and there were upon the roof about three thousand men and women, that beheld while Samson made sport.

Wesley's Notes

16:27 The roof - Which was flat, and had window's through which they might see what was done in the lower parts of the house.

Jamieson-Fausset-Brown Bible Commentary

27. there were upon the roof about three thousand men and women, that beheld while Samson made sport-This building seems to have been similar to the spacious and open amphitheaters well known among the Romans and still found in many countries of the East. They are built wholly of wood. The standing place for the spectators is a wooden floor resting upon two pillars and rising on an inclined plane, so as to enable all to have a view of the area in the center. In the middle there are two large beams, on which the whole weight of the structure lies, and these beams are supported by two pillars placed almost close to each other, so that when these are unsettled or displaced, the whole pile must tumble to the ground.

Matthew Henry's Concise Commentary

16:25-31 Nothing fills up the sins of any person or people faster than mocking and misusing the servants of God, even thought it is by their own folly that they are brought low. God put it into Samson's heart, as a public person, thus to avenge on them God's quarrel, Israel's, and his own. That strength which he had lost by sin, he recovers by prayer. That it was not from passion or personal revenge, but from holy zeal for the glory of God and Israel, appears from God's accepting and answering the prayer. The house was pulled down, not by the natural strength of Samson, but by the almighty power of God. In his case it was right he should avenge the cause of God and Israel. Nor is he to be accused of self-murder. He sought not his own death, but Israel's deliverance, and the destruction of their enemies. Thus Samson died in bonds, and among the Philistines, as an awful rebuke for his sins; but he died repentant. The effects of his death typified those of the death of Christ, who, of his own will, laid down his life among transgressors, and thus overturned the foundation of Satan's kingdom, and provided for the deliverance of his people. Great as was the sin of Samson, and justly as he deserved the judgments he brought upon himself, he found mercy of the Lord at last; and every penitent shall obtain mercy, who flees for refuge to that Saviour whose blood cleanses from all sin. But here is nothing to encourage any to indulge sin, from a hope they shall at last repent and be saved.